Development of methods of male contraception: impact of the World Health Organization Task Force Geoffrey M.H. Waites, Sc.D. Fertility and Sterility Volume 80, Issue 1, Pages 1-15 (July 2003) DOI: 10.1016/S0015-0282(03)00577-6
FIGURE 1 The structure of the World Health Organization collaborative research program on Tripterygium wilfordii (30). Waites. WHO and male contraception. Fertil Steril 2003. Fertility and Sterility 2003 80, 1-15DOI: (10.1016/S0015-0282(03)00577-6)
FIGURE 2 Relationship between sperm concentration and pregnancy rate in the World Health Organization contraceptive efficacy trial (39). Pregnancy rates per 100 person-years in each sperm concentration stratum (inset), and according to the cumulative sperm concentration. Bars indicate 95% confidence limits, and numbers in brackets are the number of pregnancies observed. Waites. WHO and male contraception. Fertil Steril 2003. Fertility and Sterility 2003 80, 1-15DOI: (10.1016/S0015-0282(03)00577-6)